This document provides useful expressions and structure for writing an informal letter to a friend in French. It suggests starting with greetings like "Dear Ilham" or "Hi, how are you", expressing thanks for a previous letter, and sharing news and plans by saying "I'd like to..." or "why don't you...". The conclusion section recommends signing off with well-wishes like "Write me soon" or "Take care" and signing your name. The document aims to help non-native French speakers write friendly letters.